RT Journal Article SR Electronic T1 ANTAGONISM OF THE FREQUENCY OF PHENYLQUINONE-INDUCED WRITHING IN THE MOUSE BY WEAK ANALGESICS AND NONANALGESICS JF Journal of Pharmacology and Experimental Therapeutics JO J Pharmacol Exp Ther FD American Society for Pharmacology and Experimental Therapeutics SP 237 OP 240 VO 125 IS 3 A1 Hendershot, L. C. A1 Forsaith, Janet YR 1959 UL http://jpet.aspetjournals.org/content/125/3/237.abstract AB The frequency of writhing motions in mice given phenylquinone intraperitoneally can be altered by low doses of Na acetylsalicylate and other low potency analgesic agents. Antagonism of the frequency of writhing is afforded by a variety of agents not usually classified as analgesics. The sensitivity of the test is greater when based on the number of writhing motions rather than on the all-or-none response.